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Giannakis et al. (*) Notice: Subject to any disclaimer, the term ofthis patent is extended or adjusted under 35 U.S.C. 154(b) by 120 days. This patent is subject to a terminal dis-claimer. ABSTRACT This disclosure describes techniques for constructing power spectral density (PSD) maps representative of the distribution of radio frequency (RF) power as a function of both frequency and space (geographic location). For example, the disclosure describes techniques for construction PSD maps using non-parametric basis pursuit form of signal expansion. Agrawal et al., "Correlated link shadow fading in multihop wireless networks," IEEE Trans. Applicant points out in accordance with MPEP 609 .04(a) that the 1989 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). Bertsekas, "Nonlinear Programming," 2nd Ed. Athena Scientific, 1999, 3 pp. (Note: Applicant points out in accordance with MPEP 609 .04(a) that the 1999 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). Applicant points out in accordance with MPEP 609.04(a) that the 1977 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). points out in accordance with MPEP 609.04(a) that the 1999 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). Applicant points out in accordance with MPEP 609. 04(a) that the 2006 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). Applicant points out in accordance with MPEP 609 .04(a) that the 1990 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so that the particular month of publication is not in issue.). (Note: Applicant points out in accordance with MPEP 609.04(a) that the 2009 year of publication is sufficiently earlier than the effective U.S. filing date and any foreign priority date of May 21, 2013 so …